Preparation method of joint production of alpha maphthol and beta naphthol

A technology of ethyl naphthol and methyl naphthol, which is applied in the field of co-production of methyl naphthol and methyl naphthol, can solve the problems of cumbersome operation and large three wastes, and achieve long purification steps, large discharge of three wastes, and pressure on three wastes Reduced effect

Inactive Publication Date: 2004-07-21
江苏华达化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Purpose of the invention: the purpose of this invention is to provide a kind of preparation method, by separating high-purity α-naphthalenesulfonic acid, β-naphthalenesulfonic acid, obtain high-purity first and ethyl naphthol through alkali fusion and acidification respectively, realize the combination production, and at the same time solve the problems of cumbersome operation and large three wastes in the general co-production process

Method used

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  • Preparation method of joint production of alpha maphthol and beta naphthol

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1. Low temperature sulfonation reaction

[0024] Add 200Kg of concentrated sulfuric acid into the low-temperature sulfonation pot, control the temperature at 50-60°C, add 100Kg of refined naphthalene evenly, keep the reaction at the same temperature for 3 hours, and suction filter at 5°C to obtain acid-containing α-naphthalenesulfonate 150Kg of acid filter cake and about 150Kg of acid mother liquor.

[0025] 2. High temperature sulfonation reaction

[0026] Add 140Kg of refined naphthalene into the high-temperature sulfonation pot, control the temperature at 120-130°C, add about 150Kg of the acid mother liquor in "1. Low-temperature sulfonation reaction" dropwise, raise the temperature to 160°C and keep it warm for 3 hours to obtain β-naphthalenesulfonic acid solution.

[0027] 3. Production of high-purity methylnaphthol

[0028] 1. Neutralization

[0029] Control the temperature of 150Kg of naphthalenesulfonic acid in "1. Low-temperature sulfonation reaction" above...

Embodiment 2

[0050] 1. Low temperature sulfonation reaction

[0051] Add 150Kg of concentrated sulfuric acid (96-98%) into the low-temperature sulfonation pot, control the temperature at 70-80°C, add 100Kg of refined naphthalene evenly, keep the reaction at the same temperature for 5 hours, and suction filter at 5°C to obtain 150Kg of wet α-naphthalenesulfonic acid and about 100Kg of acid mother liquor.

[0052] 2. High temperature sulfonation reaction

[0053] Add 70Kg of refined naphthalene into the high-temperature sulfonation pot, control the temperature at 120-130°C, add about 100Kg of the acid mother liquor in "1. Low-temperature sulfonation reaction" dropwise, raise the temperature to 160°C and keep it warm for 4 hours to obtain β-naphthalenesulfonic acid solution.

[0054] 3. Production of high-purity methylnaphthol

[0055] 1. Neutralization

[0056] Control the temperature of 150Kg of naphthalenesulfonic acid in "1. Low-temperature sulfonation reaction" above 95°C, neutralize...

Embodiment 3

[0077] 1. Low temperature sulfonation reaction

[0078] Put 800Kg of concentrated sulfuric acid (96-98%) into the low-temperature sulfonation pot, control the temperature at 20-25°C, add 100Kg of refined naphthalene evenly, keep the reaction at the same temperature for 2 hours, and suction filter at 5°C to obtain Wet α-naphthalenesulfonic acid 180Kg and acid mother liquor are about 720Kg.

[0079] 2. High temperature sulfonation reaction

[0080] Add 650Kg of refined naphthalene into the high-temperature sulfonation pot, control the temperature at 120-130°C, add about 720Kg of the acid mother liquor in "1. Low-temperature sulfonation reaction" dropwise, raise the temperature to 160°C and keep it warm for 2.5 hours to obtain β-naphthalenesulfonic acid solution.

[0081] 3. Production of high-purity methylnaphthol

[0082] 1. Neutralization

[0083] Control the temperature of 180Kg naphthalenesulfonic acid in "1. Low-temperature sulfonation reaction" above 95°C, neutralize i...

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Abstract

A process for preparing the 1-naphthol and 2-naphthol simultaneously includes sulfonating naphthalene by concentrated sulfuric acid, filtering to obtain alpha-naphthalenesulfonic acid and acidic mother liquid, dripping the mother liquid in fused naphthalene, high-temp sulfonating, hydrolyzing, blowing naphthalene to obtain high-purity beta-naphthalenesulfonic acid solution, respectively neutralizing the alpha-naphthalenesulfonic acid and beta-nephthalenesulfonic acid solution, alkali fusing, acidifying to obtain said two products, and dissolving beta-naphthalenesulfonic acid in sulfuric acid. Its advantages are high output rate and low pollution.

Description

1. Technical field [0001] The present invention relates to a kind of preparation method of co-production of methyl naphthol and ethyl naphthol, specifically, by sulfonating naphthalene with concentrated sulfuric acid at low temperature to generate α-naphthalene sulfonic acid, and the β-isomer produced simultaneously remains In the acid mother liquor, it is used for high-temperature sulfonation to produce high-purity β-naphthalenesulfonic acid, and α, β-naphthalenesulfonic acid are respectively subjected to alkali fusion to obtain high-purity methyl naphthol and ethyl naphthol respectively. 2. Background technology [0002] α-Naphthol is commonly known as carnaphthol, and it is mainly used as an intermediate of the pesticide carbaryl, and can also be used as an intermediate of some drugs and fine chemical products. Its industrial production mainly adopts naphthalene nitration, reduction, and hydrolysis. About 4% of β-nitronaphthalene is produced, and the general product conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/00C07C37/04C07C39/14C07C39/225
Inventor 徐光辉文宁锋苏建华
Owner 江苏华达化工集团有限公司
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